in math, domain is the set of possible inputs to a function while range is the set of possible outputs.
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Assuming by in you mean input and out you mean output. Input is the value that goes in while the output is the value you receive. Between these terms is a rule, called the nth term that will always work to help you find the input/output. For example. Our input is 2, and our output is 10 the rule here could be the input multiplied by 5 equals the output, or it can be something extremely difficult and unfathomable even to a banker...
if one answer is 6 and the other answer is 7, how do the output numbers from the input/output machines compare
Efficiency = Output/Input.
Collection of all output values is called the range.
If you use an input output table, domain is the input.